Carcinoma de células de transição primário em uretra de um cão macho: relato de caso

Abstract

Lower urinary tract tumors are uncommon in dogs and the transitional cell carcinoma (TCC) is the most common. The bladder being the most affected organ and the primary occurrence in the urethra is rare. It usually occurs in older dogs, affects more females and some breeds seem to be more predisposed. This study aimed to review the literature on TCC in the lower urinary tract of dogs and report a rare case of this neoplasm located specifically in the urethra of a male dog. The patient was admitted with painful urination and defecation, frequent urination, and dark yellow urine. The imaging tests of retrograde cystourethrography, transrectal ultrasonography, and urethrocystoscopy raised the possible diagnosis of neoplasm in the urethra, which was later confirmed by the histopathological exam. The association of the imaging exams was extremely important for the diagnosis, to assess the extent of the tumor, to assist the gathering of lesion samples, and for metastasis researches.